Lawn mower



cumdgyedgen nhencsuy shaped. Irwin be noted'firom' iin-examination oflllgs. 6, 7 and 8 that successive points of engagement between the cutting edges of the blades Il and the cutsaid shaft intermediate the ends of the latter and f having transverse peripheral grooves, supports fixed to said shaft near its ends and alined with y said grooves, a plurality of cutting blades each extending through one of said grooves and secured at their ends to said supports, each of said blades having a straight cutting edge, said blades tical and horizontal planes all points of the cutting edge of said blade as the latter is rotated, and means on said blade reacting with complementary means o n said reel for adjusting the blade radially of the reel so that successive points of its cutting edge engage successively along the cutting edge of said shear bar.

4. A lawn mower having in combination, a

vrotatable reel carrying a cutting blade having being arranged to engage'said shear bar at an angle, said shear bar having a cutting edge of helical shape to engage all points successively along the cutting edge of said blade as the latter is rotated, and eccentrica carried by said supports and: engaging said blades for adjusting said y blades radially of said shaft.

2. A lawn mower. having in combination. s. rotatable reel carrying a cutting blade having a substantially straight cutting edge disposed substantially parallel to the axis of rotation of said reel, and a stationary shear bar having a cutting edge arranged at an angle to the axis of said reel to engage successively and in different vertical and horizontal planes all points of the cutting edge of said blade as the latter isrotated.

3. A lawn mower having in combination, a rotatable reel carrying a cutting blade having a substantially straight cutting edge disposed substantially-parallel to the axis of rotation of said reel, a stationary shear bar having a cutting edge arranged at an angle rto the .axis of said reel to engage successively and in different vera substantially straight cutting edge disposed substantially parallel to the axis of rotation of said reel, a stationary shear bar'having a cutting edge of substantially helical shape to engage successively and indiiferent vertical planes all points of the cutting edge of said blade as the latter is rotated. and means on said blade coacting with complementary means on said reel for adjusting each of the blades radially of the reel so that successive points of its cutting edge successively engage along the cutting edge of said shear bar.

5. A lawn mower having in combination, a chassis, a shear bar fixed upon said chassis and having a cutting edge of substantially helical shape, a shaft rotatably carried by said chassis, said shaft having spaced thereon, a plurality of cutting blades, means. on said blades coasting with complementary means on' said supporting members for adjusting each of the blades radially of the shaft so that successive points of its cutting edge successively engage along the cutting edge of the shear bar, each of said blades having a straight cutting edge disposed substantially parallel to the axis of said shaft, and said shear bar being arranged at an angle to the axis of saidshaft so that its cutting edge engages all points successively along the cutting edge of each of said blades as the latter are rotated.

' GEORGE H. STONER.

support-members 

